Who can lead, who can follow.
Your reference is the browser whose bookmarks count. Twinmark keeps the others equal to it. It works with Safari, with Chrome and with the browsers built on Chrome. Here is what each one can do today.
| Browser | Can lead | Can follow | Today |
|---|---|---|---|
 Safari | Yes | No | Verified Safari 27. It needs Full Disk Access, used only to read the bookmarks. |
 Google ChromeBeta, Dev and Canary too | Yes | Yes | Verified Chrome 155, with and without Chrome Sync. |
 BraveBeta and Nightly too | Yes | Yes | Verified Tried with the real browser. |
 Microsoft EdgeBeta, Dev and Canary too | Yes | Yes | Verified Tried with the real browser. Edge asks to allow extensions from other stores: allow it, then add Twinmark. |
 VivaldiSnapshot too | Yes | Yes | Verified Tried with the real browser. |
 OperaOpera GX, Air, Beta and Developer too | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. To install the extension from the Chrome Web Store, first add Opera’s “Install Chrome Extensions” component: Twinmark reminds you. |
 Arc | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. The Browser Company no longer develops Arc: it works, but it may stop getting updates. |
 Chromium | Yes | Yes | Final tests Recognised by the app. The final test with the real browser is still to come. |
Dia | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. It needs a Mac with Apple silicon and macOS 14 or later. |
Comet | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. Perplexity’s browser. |
Yandex Browser | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
NAVER Whale | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
Thorium | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
Helium | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
Wavebox | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
Epic Privacy Browser | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
Ungoogled Chromium | Yes | Yes | Final tests Recognised by the app; the test with the real browser is still to come. |
 Firefox | No | No | Not yet It needs its own add-on. Planned for a future version, with no date and no promise. |
Using a browser that isn’t listed, like Firefox, Orion or DuckDuckGo? Tell us which browser you’d like.
Try your setup
Choose the browser that leads and the ones that follow, and see what you’d need.
Why Safari can only lead
Apple doesn’t support other apps changing Safari’s bookmarks, and editing its file from outside can damage iCloud bookmarks on all your devices. So Twinmark only reads it. Copying from Chrome to Safari isn’t promised. It will come only if it proves safe.
Profiles count one by one
Twinmark works with profiles, not whole browsers. Your work and personal Chrome profiles are two separate places, and each one that follows counts as one. With Premium, a second profile of the same browser can follow the first.
See what Premium addsWhat the extension can see
One extension from the Chrome Web Store works in Chrome and in the browsers built on Chrome. It doesn’t read web pages, your history or anything else besides bookmarks.
bookmarks- Reads and changes the bookmarks of the profile you chose.
nativeMessaging- Talks to the Twinmark app on the same Mac. Messages never leave your computer.
storage- Keeps a random ID for the profile and a short record of the last changes, so an interrupted sync can resume.
alarms- Reconnects to the app after it restarts.